A. J. Preller (born June 20, 1977) is the president of baseball operations and general manager of the San Diego Padres of Major League Baseball (MLB). He was hired by the Padres on August 5, 2014 while serving as the assistant GM for the Texas Rangers, overseeing the player development and scouting departments and serving as a key advisor on all player acquisitions. At the time, he was 36 years old.